Got these prices from my local stock holder.
2m x 1m x 2mm ally tread = £34.20 each + vat
2m x 1m x 2mm ally plain = £29.80 each + vat
2m x 1m x 2mm galv sheet = £26.20 each + vat
Half the price of metals4u...
Think I may pic up a sheet of tread and plain next week
TT